Television or like system and apparatus



Nov. 11, 1930. J. L. BAIRD 1,781,210

TELEVISION OR LIKE SYSTEM AND APPARATUS Filed April 8, 1929 2Sheets-Sheet l l 1 I I I x l/Wlmfal Nov. 11; 1930. J. BAIRD TELEVISIONOR LIKE SYSTEM AND APPARATUS Filed April 8, 1929 2 Sheets-Sheet 2Patented Nov. 11, 1930 JOHN LOGIE ZBAIRD, or LONDON, ENGLAND, A$SIGNOR rTELEVISION LIMITED, on

- 1 LONDON, nnernnn, A BRITISH COMPANY TELEVISION 0R LIKE SYSTEM ANDAPPARATUS 7 Application filed April 8, 1929, Serial No. 353,636, and inGreat Britain na ia'ieas.

This invention concerns improvements in or relating to televisionor'like systems and apparatus which are used for the transmission to adistance of a reproduction of an object, view, or scenehere inafterreferred to as a picture.

The invention relates to that type of the above apparatus wherein thereis employed a device (for example a rotating disc with a spiralarrangement of holes, lenses, or other light-apertures) which effectsexploration, in

a series of parallel bands. With such a device, one dimension, ofthearea of the object or picture explored is determined by the number ofthe bands which are used in the exploration. 1 v

' There the picture to be produced is oblong in form it is sometimesadvantageous to view it with the longer side of the oblong horizontaland sometimes advantageous-to view it with the longer side vertical.That is to say,

certain pictures are best obtained in are production theside of which islong and the height relatively short, other pictures with the heightgreat and the width relatively small. Y

Accordingto the present invention means are provided-in the transmitterand receiver whereby the same machine can view or show 3 the picture ineither form.

The invention comprises the provision, in television or like apparatuscomprising an exploring device having a series of lightapertures whicheffects exploration in a series of parallel bands, of means foradjusting the orientation of those bands for the purpose above referredto.

In such apparatus wherein the exploring device is constituted by arotating disc pro vided with a spiral arrangement of lightapertures,adjustment of'the orientation of the-bands may be obtained by renderingthe light-apertures effective, as regards their exploring function, atdifferent points-of their ment may be such that exploration is effectedat apart of the apparatus where the lightapertures are travellingsubstantially vertically, or at a part Where the light-apertures aretravelling substantially horizontally.

-mitting station is fed through terminals 16 path of travel. Forexample, the arrange In "the former case, the exploration is suitablefor. a pictureof greater height than width while in the latter case itis suitable fora picture of greater width than height.

Convenient constructions of apparatus that come within the scope of thepresent invention will now be described by way of'example and by the aidof the accompanying diagrammatic drawings, in which* Flgures 1, 2 and 3illustrate different forms "of receiving apparatus; and

Figures 4, 5, 6 and 7 different forms of transmitting apparatus. I

In Figure 1 the receiving apparatus compr ses an exploring disc 2having'the usual spiral arrangement of holes, mirrors, lenses or otherlight-apertures indicated at 4.v In the front part 6 of the casing ofthe apparatus are formed two viewing apertures 8 and 10 behind each ofwhich and behind the disc 2 is located, respectively, a glow lamp orother light-screen 12, 14. Current modulated by the picture signals fromthe transand conductors 18,20 to either of the lamps 12, 14 according tothe setting of aswitch 22. With this apparatus, if the picture to bereceived has its vertical dimension longer than its horizontaldimension, it will be viewed through the aperture 8 at the side of thedisc 2, the switch 22 being so set that the lamp 12 is illuminated;while the vertical dimension ofthe picture is less than the horizontaldimension, the aperture 10 at the top of the disc 2 will be employed,the switch 22 being set to illuminate the lamp 14.

' In Figure 2 a single viewing'aperture 24 is formed in a part 26 of thefront of the casing of the receiving apparatus. Thispart 26 is supportedby a shaft 28rotatable in bear ings 30 secured to the casing andarranged in line with the shaft of the exploring disc 2.. A lamp 32 ismounted upon' an arm 34 rotatable on a bearing sleeve 36 for the shaftof the exploring disc 2. To rotate the part 26 in companywith the arm 84there is mounted, in a bearing'SS in the casing, a counter shaft 40carrying sprocket wheels 42 which are coupled, respectively, by drivingbands 44 with sprocket wheels 46, one on the I shait 28 and the other onthe hub'of the arm I i 34. The shaft 40 has a hand-wheel 48 by which itmay be turned; In the use of this apparatus, when the picture has itsgreater cimension' disposed horizontally, the part 26 and-the lamp32will be adjusted by turning the countershaft 40 to bring the viewingaperture 24 and the lamp 32 to the' top of the i disc 2, as shown inFigure 2. On'the other *han-dfifthe longer dimension of the picture isvertically disposedfthe part" QGandthe lamp 82 will; be adjusted by:thehand-Wheel 1. 4 8 tobringthe aperture eaanduie lamp- 32to the sideof: the disc 2; The construction of F1gure-2,*1s also useful inframing'the p tu ret as small inaccuracies 1X1 training can berectifiedjby adjusting, by means of'the handshown) supported on't'hecasing oi? the appa- I v 7 I ,fslon arisesfrom'onetothe other of the twopositions occupied byin the lamps '60,:62in

fiexibleleads connected withterminals (not ratus; i V I The receivlngapparatus of, Figure 3 has single viewing aperture52, placed oppositethelamp 54 to which, the picture. signals "are. fedzby' way of terminals56, the exploring;

disc 2 being located; as in the constructions of, Figures land2,1;between the aperture 52 rand lam-p 54. As shown in Figure 3, the ap-,wparatustis adapted for the viewingof -van'ob'- long picture which hasits greater dimension- 'disp'osed vertically. "NVhenLa picture havingits greater dimension: disposed. horiz'ontally ,is to be viewed, theapparatus is turned;

through, a right angle so that'it rests upon ,What previously was itsside 58;]This -ad-g just'lnent brings'the; aperture 52 tothe top of .theexploring disc and,' of course, turnsithe cap erturethrough a rightangle making-1t suitable for the picture to be viewed. a

- A" transmittinglappar atus akin in con-l a'struction-t'o the receiver01" Figure l is shown,

7 in Figure'4, in which the front part 7 of the; apparatus has formed init two framing apertures 9 and 11, behind eachof which, ,respectively,is a light-sensitive cell 13,'

'- 'An exploring disc 3 extending ,bet'ween'fthe,

, apertures and cells has the usual spiral-ar-i.

' rangement of light-apertures which are'in'di- :cated at 5} Currentmodulated by the cells is" fed; to the amplifying Or -transmitting partof the apparatusby conductors 19,121 and" terminals 17, a switch23'beinglset according I to which of the cells 13, 15 'isin use; itbeing;

' understood that the cell l3fwill be in circuit for thetransmissionfo'f a vertically-disposed" Adjustments corresponding-tojtheabove, V

11161181011 1s disposed, respectively, hor zon- Will be made atthetransmitting. station;

oblong picture and cell 15"forlan oblong pic ture which is horiaontallydisposed The object of which an image is tobe transinitted f will besituated in front of the apparatus and on or about on the linepassingthrough the centres of the cell 13 and aperture 9 or the cell 15and aperture'll, asthecasemay be;

' A transmitting apparatus of the type is indicated in Figure 5. Inthis'apparatus there are'two projecting lamps 60, 62, the .lamp being1sosituated in relation to :the

disc 3 'that the object 64 willbe explored'by top of the 'di'sc 3,"aipositieni sui table for-the transmission of an oblong plcture whosewherein the object is explored by a lightspot i the light-apertures 5when, these are at the greater dimension"is horizontally disposed.Th-e'lamp 62isarranged sothat the object 64 isexploredby thelightapertures when on the "side of the" disc,""thisfarrangement dealingwith the transmission of an oblong; picture that is vertically disposed.If theiampeeo,

62 are electric .la npjsg-suitable switching gear may be provided'sothat either of themmay be in actiontothe .exclusion of the other. 1 Or,

alternatively; a single lamp may be employed and provision made forshifting it as .occa- I Figure 6 shows "a transmitting apparatus havingprovision for adjustment of the same l" kind asthatof the receiver ofFigure 2. In t Figure '6 the ebjecty64 isexplpl'ed by jan-ex-lploringdisc. 3 anda lightrsen'sitive ,ce11f33, 3 through a flamingaperture25 in a pa rtition 2'Zj-This partition is mounted'upon' ashaft'7 29fsupported' in a fixed bearingiilin line with i 1 the shaft of thediscS, the. shaft '29 carrying also an arm 35. upon which the-cell 38 issup-' ported-conductors 51 leadingthe current l ted 'byith el 3 ihesemplifi I other part, of the transmittin'g'apparatus. V V

;-In this construction theshaft 291's t-urned I a hand-wheel; 49 tobringthe .cell 33.;and;i 105 aperture 25 to the top or the side ofthediscto p deal with an oblong picture Whose greater diceiver of Figures.This transmitter-com;

prises a casing the front partof whichghasa single framing aperture 53,Behindthis aperture 53 there is a light-sensitive cell 55;which iselectrically. connected withj' 'terininals 57 I from: whichcurrent'modulated by the eel-1'55. .is led to the transmittingpart ofthe'apparatus. :;;The obj ect, of which an image is to be transmitted,will be located on orab'outon the line passing through thevcentresof theaperr ture 53 and cell55 and will be explored by the,

mg the hand-Wheel 49, as in theconstruction lightaperturetlofthe, disc 3which v extends between itand the aperture 53 and cell 5 5. As intheconstruction {of Figure 3, the. ap-

paratus will be turned so cas to rest ionthe part 59 which is sideinFigure 7 when;

an oblong picture is to be transmitted the longer dimension of which ishorizontally disposed. As shown in Figure 7 the osition of the apparatusis suitable for an 0 long pictufe which has its greater dimensionvertica 1. In apparatus for use in transmitting light images, thecombination With an exploring device, of an opaque screen disposedadjacent said device, spaced portions of said screen being constructedto permit passage of light through the same and through said exploringdevice to frame the image, means for associating electrical and lightimpulses, and means for rendering said last named means operativeadjacent one only of said spaced portions on the screen.

2. In apparatus for use in transmitting light images, the combinationWith a rotatable exploring device, of an opaque screen cooperating Withsaid device, said screen having framing apertures spaced about theexploring device, a plurality of elements for associating electrical andlight impulses, one of said elements being operatively related to eachaperture, and means for rendering any one of said elements operative toorientate the image.

3. In apparatus for use in transmitting light images, the combinationWith a rotatable exploring device, of an opaque screen cooperating withsaid device, said screen hav ing framing apertures spaced about theexploring device, a plurality of elements for associating electrical andlight impulses, one of said elements being operatively related to eachaperture, an electrical circuit, and means for selectively including oneof said elements in the circuit to orientate the image.

In testimony whereof I aflix my signature.

JOHN LOGIE BAIRD.

